Looking for a way to couple your 10 round AR-15 magazines together? Look no further than the Caldwell Shooting Supplies AR-15 Magazine Coupler! The Caldwell Mag Couplers are designed out of high strength polymer to easily join 2 Mil-Spec Style 10 round AR-15 magazines together and not add weight. The coupling of magazines increases capacity and makes for faster reloads when seconds matter.